I'll give you a brief rundown.
There is 10 suits. Each has a basic ability and a few super abilities.
Anchor - locks all cards to the left
Hook - Uses one of your cards
Kracken - Forces you to place 2 additional cards on the board or draw
Map - draw a card from the discard pile
Mermaid - worth extra points
Cannon - Pick highest card from pile of your choice to discard
Sword - Steal a highest valued card from suit you do not already have
Oracle - See next card
Chest and Key - once you have both you will gain 1 bonus card for each card you have on the board when you accept the board
Super Abilites are bought in packs of 3
Oracle has an ability that you can see the next 3 cards instead of 1.
The goal of the game is to have the highest total of all the top cards by the time the draw pile runs out of cards.
If you draw two of the same suit you bust.
Each level you need to reach a point goal before moving on. Each level may change the rules a bit.
It's well worth 4.99 or whatever it cost.